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[Brother GT-381] Not your average GT 381 white ink issue

 
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Old June 22nd, 2016 Jun 22, 2016 8:00:31 AM -   #1 (permalink)
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Default Not your average GT 381 white ink issue

We have a Brother 381 thats been getting all of its prompted services and parts exchanges and we've developed a problem on the #4 white line. When we do the hose cleaning we don't get the nice little bubbles on any of the lines, and on line #4, the fluid doesn't pump continuously through the line. Weak shots of the fluid come up but much less than what its supposed to be. Then when I fill the tube with white ink, the ink reaches the head, but fills to about 1/2 inch above the filter and the rest of the line shows gaps of air.

We've changed the filter and checked the drain tubes. When I run a white test I get some of head #4 to print well but it uses the small amount in the tube then runs out, with no new ink getting pumped to the head. Brother say to swap head 4 with head 3 and see if the problem travels over. Im thinking with no ink pumping to the head, somethings up with the line. Heads 1,2 and 3 get their white ink just fine. Any ideas?
 
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Old June 22nd, 2016 Jun 22, 2016 9:40:28 AM -   #2 (permalink)
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Default Re: Not your average GT 381 white ink issue

Something similar in this thread.
 
Old June 22nd, 2016 Jun 22, 2016 3:10:57 PM -   #3 (permalink)
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Default Re: Not your average GT 381 white ink issue

Do the head swap test, then you can start eliminating factors.
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Old June 23rd, 2016 Jun 23, 2016 11:46:08 AM -   #4 (permalink)
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Default Re: Not your average GT 381 white ink issue

Swapped out heads 3 and 4, now 3 doesn't print and 4 does so I guess that means the one in head 3 is plugged. Noticed something else: when we do white tube cleanings and the filter cartridge goes in, I don't get a steady stream of bubbles cleaning the inside of the tubes. I get a 1/4" wide shot of something going through every 5 seconds. Does that mean the filter / maintenance cartridge is bad?
 
Old June 23rd, 2016 Jun 23, 2016 5:12:27 PM -   #5 (permalink)
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Default Re: Not your average GT 381 white ink issue

Sounds like you've pinpointed the issue is with the head.
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Old July 5th, 2016 Jul 5, 2016 1:36:43 PM -   #6 (permalink)
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Default Re: Not your average GT 381 white ink issue

The issue is with the head but why would it get some ink and print ok until that ink was gone? Think blockage of the head sealed the line and didn't allow the ink to flow as it should?
 
Old July 5th, 2016 Jul 5, 2016 4:41:08 PM -   #7 (permalink)
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Default Re: Not your average GT 381 white ink issue

Because it can still 'prime' and have some ink in the reservoir. Then after a few prints that buffer disappears and you get the problem. It could mean the nozzles aren't clogged, but something between the ink feed and nozzle has a blockage.
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Old July 26th, 2016 Jul 26, 2016 8:29:36 AM -   #8 (permalink)
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Default Re: Not your average GT 381 white ink issue

aldenski, when the filter was replaced did you ensure the tubing was not lose or damaged when reconnecting filter? Have you happen to swap the heads as instructed by our support team? Depending on the environment your printer has been kept in, the lower tubing may have built up some excess ink and dried creating less pressure. By swapping the location of 3 & 4 this should give an idea of the integrity of the lower tubing. If your located within the US or Canada and this didn't resolve your issue, please give us a 877-4Brother or contact your original dealer if outside these areas.
 
Old July 29th, 2016 Jul 29, 2016 2:14:27 PM -   #9 (permalink)
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Default Re: Not your average GT 381 white ink issue

Tubing was good. Support team didn't tell me to swap the heads - that was my idea. Environment is fine, humidity is fine, hygrometer installed inside machine. Flushed out the derelict head and its fine now and holding in reserve.
 
Old November 18th, 2017 Nov 18, 2017 12:01:52 PM -   #10 (permalink)
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Default Re: Not your average GT 381 white ink issue

Will doing multiple tube cleanings break down the clots over time?
 






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